Adjustable back for chairs.



H. MERTZ. v ADJUSTABLE BACK FOR CHAIRS.

APPLICATION FILED DEC. I9, 1917.

Patented Aug. 6, 1918.

2 SHEETS-SHEET 1.

H. MERTZ.-

ADJUSTABLE BACK FOR CHAIRS.

APPLICATION FILED DEC- I9| I917.

gwuehi oz HafryM Patented Aug. 6, 1918.

2 SHEETS-SHEET 2.

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3% WdQJW I ,lIbom UNITED STATES.

HARRY MEBTZ, OF BALTIMORE, MARYLAND.

ADJUSTABLE BACK r03. CHAIRS.

Application filed December 19, 1917. Serial No. 207,948.

. To all whom it may concern:

Be it known that HARRY MER'rz, a citizen I of the United States,residing at Baltimore,

in the county of Baltimore andState of Maryland, has invented certainnew and useful Improvements in Adjustable Backs for Chairs; and he doeshereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings,

and to theletters and figures of reference marked thereon, which 'form apart of this specification. i

This invention relates to new and useful improvements in adjustablebacks for chairs,

the object in View being to produce a simple-- and eflicient device ofthis nature which will brace the back of the person sitting in the chairand cause the chest to be thrown back and the abdomen forward andproducing a chair which will be thoroughly hygienic.

More specifically the present invention consists in the provision of anadjustable back for a chair designed especially for use where'laborersare accustomed to work for long hours while sitting down and serving tobrace and ease the back.

The invention consists in various details of construction, combinationsand arrange- .ments' of parts which will be hereinafter fully described,shown in the accompanying drawings and then specifically defined in theappended claims. I

The invention is illustrated in the accompanying drawings which, withtheletters of reference marked thereon, form a part of thisspecification and in which:

Figure 1 is a side elevation of a chair made in accordance with myinvention.

Fig. 2 is a front elevation. Fig. 3 is a view showing the chair in anadjusted position, and'Fig. 4 is a sectional plan view.

Reference now being had tothe details of the invention by letter:

A designates the seat of an ordinary chair and wherethe usual back is tobe converted into aswinging one. The side posts and the intermediateslats or rounds are cut off and a strip, designated by letter B of anysuitable material, is adapted to fit over the lower ends of the Sidepieces orrounds, thus securely bracing the same. Rods designatedSpecification of Letters. Patent.

the seat adjacent to the edges thereof, and

H designates a bail-shaped member having ATENT' OFFICE.

to the marginal edges of the back, also angled :ends H which arepivotally connected to the rods C. Said bail-shaped member is adapted toengage corresponding notches in the two plates H, according as it may bedesired to hold the rods in different adjusted positions. In the eventof, aperson sitting on the chair desiring to sit on the forward edge ofthe chair, the bail-shaped member is adjusted so that the back -willswing forward to a convenient position, so that the back of the personwill engage the back of the chair when sitting in' such position. If theperson desires to sit well back in the chair, the bail-shaped member maybe swung out into notches toward the rear of the chair, as will beunderstood.-

In any of the adjusted positions of the chair it will be understood thatthe back will swing upon its pivot and a person may-sit in an inclinedposition by simply leaning backward.

By the provision of E chair made in accordance with my invention, asimple and eflicient device is afforded which will meet a long feltwant, especially in factories where laborers have long hours to sit attheir Work, and which will brace and strengthen the back, and at thesame time afford hy-' gienic means for causing the person to sit erect.

What I claim to be new is:

1. An adjustable back for chairs comprising a seat and a back, plates.secured to the rear portion of the seat-upon opposite sides andhavingnotches-therein, rods pivotally connected to said plates and back,a member pivoted at its ends to said rods and adapted to engage thenotches in the plates.

2. An adjustable back for chairs comprising a seat and a back, platessecured to the rear portion of the seat upon opposite sides and havingnotches therein, rods pivotally connected to said plates and back, abailshaped member adapted to engage oppositely disposed notches in .saidplates, and

havin angled end portions pivotally connecte tosaid rods.

3. In combination with e chair seat, pletee fastened to the uppersurface of the seat near the rear portion thereof end opposite eachother, each plate, having an opening the marginal edge of which isnotched, rode pivoted to said pletes in advance of the openings therein,a book to which the upper ends of the rods are pivoteolye heil-shepedlmember passing through said openings and eng'egin opposite disposednotches therein seid heil-shepeo member having engiefi.

to seid rods,

pon'tIons extendim mitside the pletes, the extreme ends of the memberbeing curved toward each other end pivotelly connected 15 In testimonywhereof .T hereunto efix my signature in presence of two witnesses,

HARRY MERTZ,

Witneseee:

A. L, Home Fmmnmrq 18L. Element

